#include <QCoreApplication>
#include <iostream>
#include <math.h>
using namespace std;
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    double A,B;
    cout <<"Vvedite a u b"<<endl;
    cin >>A;
    cin >>B;
    cout<<"Otvet: "<<sqrt(A*B);
    return a.exec();
}
